I'm never actually put into a game when I enter a tourney. I just sit in the lobby and every five minutes or so there is a game result I had nothing to do with. Its like a bit plays in my place while I just sit in the lobby. There are a lot of ties, somehow? "Match was invalidated by the server, returning to lobby" seems to pop up after every match result.
Hm, can you please report the bug with us here. I'll pass it over as well!